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Carlo Fiorina

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Publications associées (37)

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Extension of GeN-Foam to departure from nucleate boiling prediction and validation against the OECD/NRC PSBT benchmark

Carlo Fiorina, Alessandro Scolaro

The prediction of departure from nucleate boiling (DNB) has always been a crucial aspect of thermal-hydraulic codes for the analysis of Light Water Reactors. In this paper, GeN-Foam, a multi-physics code developed based on OpenFOAM, has been enhanced to in ...

Elsevier Science Sa2023

Investigation on the effect of eccentricity for fuel disc irradiation tests

Andreas Pautz, Carlo Fiorina, Alessandro Scolaro

A varying degree of eccentricity always exists in the initial configuration of a nuclear fuel rod. Its impact on traditional LWR fuel is limited as the radial gap closes relatively early during irradiation. However, the effect of misalignment is expected t ...

2021

Development of a novel two-phase flow solver for nuclear reactor analysis: Validation against sodium boiling experiments

Andreas Pautz, Carlo Fiorina, Stefan Radman

Recent numerical advancements at the Laboratory for Reactor Physics and Systems Behaviour (LRS) have led to the development of a novel two-phase porous medium-based thermal-hydraulic simulation tool, integrated in the broader multi-physics framework of the ...

ELSEVIER SCIENCE SA2021

A Simplified Numerical Benchmark For Pool-Type Sodium Fast Reactors

Andreas Pautz, Konstantin Mikityuk, Carlo Fiorina, Stefan Radman

The current work presents a simplified benchmark for a pool-type Sodium Fast Reactor based on a 2D (r-z) geometry for testing tightly-coupled spatial neutron transport, thermal-hydraulics and thermal-mechanics modeling. The new benchmark is motivated by de ...

AMER SOC MECHANICAL ENGINEERS2018

Application of multiphysics model order reduction to doppler/neutronic feedback

Carlo Fiorina

In this paper, a proper orthogonal decomposition based reduced-order model is presented for parametrized multiphysics computations. Our application physics is Doppler feedback in a simplified model of the molten salt fast reactor concept. The reduced model ...

EDP Sciences2019

Development of a High Fidelity Model of the CROCUS Experimental Reactor

Andreas Pautz, Carlo Fiorina, Tom Mager

Measurements of scalar flux distributions with fine spatial and energy resolutions are needed to remedy one of the validation shortcomings of the novel neutronics full core solvers, such as MPACT and nTRACER. While a very detailed resolution of the flux ca ...

American Nuclear Society2022

Development of a semi-implicit contact methodology for finite volume stress solvers

Andreas Pautz, Alessandro Scolaro, Carlo Fiorina

The past decades have seen numerous efforts to apply the finite volume methodology to solid mechanics problems. However, only limited work has been done by the finite volume community toward the simulation of mechanical contact. In this article, we present ...

Wiley2022

Bayesian Data Assimilation for Fuel Performance based on OFFBEAT

Andreas Pautz, Mathieu Hursin, Alessandro Scolaro, Carlo Fiorina

The EPFL and the PSI have been developing in recent years a new fuel performance tool named OFFBEAT. The tool is based on the OpenFOAM finite-volume library and allows for 1.5-D, 2-D and 3-D fuel performance analyses, both for base irradiation and for tran ...

American Nuclear Society2022

Development in OFFBEAT of a dynamic-mesh incremental stress-strain solver and validation against the IFA 650.2 ballooning experiment

Andreas Pautz, Alessandro Scolaro, Carlo Fiorina, Edoardo Luciano Brunetto

OFFBEAT is a 1D, 2D and 3D fuel behavior code under development at the École Polytechnique Fédérale de Lausanne (EPFL) and the Paul Scherrer Institute (PSI). In this paper, an incremental stress-strain solver with dynamic mesh update is presented and preli ...

American Nuclear Society2022

CORE SIM+ simulations of COLIBRI fuel rods oscillation experiments and comparison with measurements

Andreas Pautz, Vincent Pierre Lamirand, Mathieu Hursin, Carlo Fiorina, Oskari Ville Pakari, Pavel Frajtag, Axel Guy Marie Laureau, Adolfo Rais, Daniel Godat, Paolo Vinai

At EPFL, the CROCUS reactor has been used to carry out experiments with vibrating fuel rods. The paper presents a first attempt to employ the measured data to validate CORE SIM+, a neutron noise solver developed at Chalmers University of Technology. For th ...

2021

GEN-FOAM: An OpenFOAM (R)-Based Multi-physics Solver for Nuclear Reactor Analysis

Carlo Fiorina

A multi-physics solver for nuclear reactor analysis, named GeN-Foam (Generalized Nuclear Foam), has been developed by the Laboratory for Reactor Physics and System Behavior at the EPFL and at the Paul Scherrer Institut (Switzerland). The developed solver c ...

SPRINGER INTERNATIONAL PUBLISHING AG2019

Preliminary safety analysis of the TRANSMUTEX sub-critical reactor using the GeN-Foam multi-physics solver

Andreas Pautz, Carlo Fiorina, Thomas Arthur Louis Joseph Guilbaud

This work presents a preliminary safety analysis of the accelerator-driven system under development at TRANSMUTEX. It is a sub-critical lead-cooled fast reactor with a nominal power of 300 MWth having the following features: (1) an inert-matrix fuel; (2) a ...

Pergamon-Elsevier Science Ltd2023

VALIDATION OF THE GEN-FOAM MODEL OF THE CROCUS EXPERIMENTAL REACTOR

Andreas Pautz, Carlo Fiorina, Tom Mager

Since 2013, the Laboratory for Reactor Physics and Thermal-Hydraulics at the PSI and the Laboratory for Reactor Physics and Systems Behaviour at the EPFL are working towards the development of a multi-physics platform for coupled reactor analysis based on ...

American Nuclear Society2021

First Steps Towards The Development Of A 3D Nuclear Fuel Behavior Solver With Openfoam

Andreas Pautz, Alessandro Scolaro, Carlo Fiorina

A new 3D fuel behavior solver is currently under collaborative development at the Laboratory for Reactor Physics and Systems Behaviour of the Ecole Polytechnique Federale de Lausanne and at the Paul Scherrer Institut. The long term objective is to enable a ...

AMER SOC MECHANICAL ENGINEERS2018

Implementation of a multidimensional diffusion-based neutronics solver in OFFBEAT

Alessandro Scolaro, Carlo Fiorina, Edoardo Luciano Brunetto

The OpenFOAM Fuel BEhavior Analysis Tool OFFBEAT is a multi-dimensional fuel performance code under development at the École Polytechnique Fédérale de Lausanne (EPFL) and the Paul Scherrer Institute (PSI), in Switzerland. The latest developments are orient ...

American Nuclear Society2022

Extension of GeN-Foam to modeling of boiling water and validation against the OECD/NRC PSBT benchmark

Carlo Fiorina, Stefan Radman

The OpenFOAM-based GeN-Foam solver has recently been extended to allow simulating water boiling based on a porous-medium approach. This paper describes such extension and preliminarily validates it based on the OECD/NRC PSBT benchmark. Three benchmark exer ...

ELSEVIER SCIENCE SA2023

Creation Of An Openfoam Fuel Performance Class Based On Fred And Integration Into The Gen-Foam Multi-Physics Code

Andreas Pautz, Konstantin Mikityuk, Carlo Fiorina

The FRED code is an in-house tool developed at the Paul Scherrer Institut for the so-called 1.5-D nuclear fuel performance analysis. In order to extend its field of application, this code has been re-implemented as a class of the OpenFOAM numerical library ...

AMER SOC MECHANICAL ENGINEERS2018